What is a stone?
A stone is 14 pounds, or about 6.35 kilograms, and the United Kingdom and Ireland use it almost entirely for body weight. Elsewhere people use kilograms or pounds.
We provide a calculator on this site to convert stones to kilograms.
What is a gram?
A gram (g) is one thousandth of a kilogram. A paper clip weighs about a gram, and food ingredients, jewelry and medication doses are weighed in grams.